Scalar implicature

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Scalar implicature, also called quantity implicature, is a kind of indirect meaning that appears when a speaker uses a weaker term on a scale instead of a stronger one. The listener infers a stronger claim behind the literal words. For example, “Some students can afford a new car” usually implies “Not all students can afford a new car,” even though the sentence doesn’t logically say that.

These inferences come from practical use, not from literal logic. They can be defeated or canceled by context, and they are not guaranteed to be true just because the sentence is true. They are about what the speaker chose to say, not about the plain meaning of the words.

The classic explanation (Gricean) says speakers follow the maxim of quantity: be as informative as needed. If a stronger, true statement were available, the speaker would have said it. Since they didn’t, listeners infer that the stronger statement isn’t true or not appropriate.

There is also a grammatical view: some linguists argue that scalar expressions involve an extra grammatical element that generates the implicature, and this can interact with other parts of the sentence and with context.

Examples:
- “Some students can afford a new car” often implies “Not all students can afford a new car.”
- Phrases like “half finished” can produce stronger scalar inferences than verbs like “start,” depending on context.

Research with children shows mixed results: five-year-olds may have limited ability to derive scalar implicatures from some verbs, but they can do better with clear degree words like “half.” They can also suspend the implicature when the context doesn’t support it.

In short, scalar implicature is the extra, often unstated meaning we draw from using a weaker term. It depends on context, can be canceled, and is a topic of ongoing discussion in linguistics, with both pragmatic and grammatical accounts.